Zilog Z8F0130 - Manual (Page 347)

UM013037-1212 Structured Assembly Processing
Zilog Developer Studio II – Z8 Encore!
User Manual
323
•
The .$CONTINUE assembler directive is optional. It can be specified an arbitrary
number of times between the .$WHILE and .$WEND directives.
•
Any valid assembler statement can appear in the statements sections of the structured
assembly test directives. This means, among other things, that structured assembly test
directives can be nested. The structured assembly test directives can be nested up to
255 levels.
•
Nested .$BREAK and .$CONTINUE directives are associated with the most recent
.$WHILE directive.
•
There is no preset limit on the number of statements that can appear in the statements
sections; there can be any number of assembler statements in each statements section,
including zero. The operating system file system might impose limitations on file
sizes, and the user must consult the appropriate operating system users guide for such
limitations.
•
The .$WHILE and .$WEND directives must be coded in matching pairs. That is, it is
not legal to code a .$WHILE directive without a matching .$WEND directive appearing
later in the source module nor is it legal to code an .$WEND directive without a match-
ing .$WHILE directive appearing earlier in the source module.
•
The .$BREAK and .$CONTINUE assembler directives can only appear between
enclosing .$WHILE and .$WEND directives (or between .$REPEAT and .$UNTIL
directives). It is not valid for the .$BREAK and .$CONTINUE directives to appear in
any other context.
•
The .$BREAK directive has an optional .$IF conditional parameter.
•
The .$CONTINUE directive has an optional .$IF conditional parameter.
•
None of the .$WHILE , .$BREAK , .$CONTINUE , and .$WEND assembler directives can
be labeled. If a label is specified, a warning message is issued, and the label is dis-
carded.
Structured Assembly Processing
The following sections describe the assembly-time processing of structured assembly
directives:
•
Validity Checks – see page 323
•
Sequence of Operations – see page 324
Validity Checks
The following validity checks are performed on the structured assembly block input data.
Unless otherwise specified, violations cause the assembly to fail.